Governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine

ABSTRACT

A governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine which has a control rack for controlling the fuel delivery of a fuel injection pump, a link pivotally connected at one end to one end of the control rack, a floating lever pivotally connected at one side thereof to the other end of the link, a start spring fixed at one end thereof to a housing and secured at the other end thereof to one side end of the floating lever, a guide lever pivotally secured at one end thereof to the housing by a first fulcrum and engaged through a first shaft at the intermediate thereof with the intermediate of the floating lever, pivotally mounted centrifugal weights pivotally secured to the drive shaft of the fuel injection pump, a shifter axially slidably engaged with the drive shaft and the centrifugal weights at one end thereof and pivotally secured at the intermediate thereof to the other end of the guide lever, a regulator lever pivotally secured at one end thereof to the first fulcrum and slidably contacted at the other side with the other end of the shifter, a spring secured at one end thereof to the intermediate of the regulator lever, a stopper for stopping the regulator lever at the other end in full load of the fuel injection pump, and a throttle lever secured at one end thereof to the other end of the spring and pivotally secured at the same side thereof to the housing by a second fulcrum and manually operable at the other end thereof, the improvement in the governor having cam means having an axially long hole slidably engaging the other end of the floating lever through a movable fulcrum for controlling the control rack so that the control rack does not move abruptly when the throttle lever is quickly operated, and stopper means contacted with the cam means for stopping the cam means so that the control rack is not pushed to the maximum fuel injection position of the fuel injection pump when the engine is in no load and at minimum speed.

United States Patent Nakamura et a1.

[451 Feb. 12, 1974 1 GOVERNOR FOR CONTROLLING THE FUEL DELIVERY OF A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE lnventors: Yoshiatsu Nakamura, Oomiya;

Susumi Odashima, Oyama, both of Japan Primary ExaminerLaurence M. Goodridge Assistant Examiner-Ronald B. Cox Attorney, Agent, or FirmArmstrong & Wegner [57] ABSTRACT A governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine which has a control rack for controlling the fuel delivery of a fuel injection pump, a link pivotally connected at one end to one end of the control rack, a floating lever pivotally connected at one side thereof to the other end of the link, a start spring fixed at one end thereof to a housing and secured at the other end thereof to one side end of the floating lever, a guide lever pivotally secured at one end thereof to the housing by a first fulcrum and engaged through a first shaft at the intermediate thereof with the intermediate of the floating lever, pivotally mounted centrifugal weights pivotally secured to the drive shaft of the fuel injection pump, a shifter axially slidably engaged with the drive shaft and the centrifugal weights at one end thereof and pivotally secured at the intermediate thereof to the other end of the guide lever, a regulator lever pivotally secured at one end thereof to the first fulcrum and slidably contacted at the other side with the other end of the shifter, a spring secured at one end thereof to the intermediate of the regulator lever, a stopper for stopping the regulator lever at the other end in full load of the fuel injection pump, and a throttle lever secured at one end thereof to the other end of the spring and pivotally secured at the same side thereof to the housing by a second fulcrum and manually operable at the other end thereof, the improvement in the governor having cam means having an axially long hole slidably engaging the other end of the floating lever through a movable fulcrum for control ling the control rack so that the control rack does not move abruptly when the throttle lever is quickly operated, and stopper means contacted with the cam means for stopping the cam means so that the control rack is not pushed to the maximum fuel injection position of the fuel injection pump when the engine is in no load and at minimum speed.

3 Claims, 3 Drawing Figures PAIENIED 2'974 3.791.362

sum 1 0r 3 I Fig. I

PAIENIED FEB I 2 I974 SHEET 2 BF 3 F I g. 2

-0 m 6 Mo k 7 lifzil K97/)11/1 MA EZ i-j m *4 W Y I70 GOVERNOR FOR CONTROLLING THE FUEL DELIVERY OF A FUEL INJECTION PUMP FOR AN INTERNAL COMBUSTION ENGINE BACKGROUND OF THE INVENTION This invention relates to a fuel injection pump of an internal combustion engine, and more particularly to improvements of a governor for controlling the fuel delivery of a fuel injection pump for an internaljcombustion engine.

In the conventional governor of this type, a control rack for increasing and decreasing the fuel delivery of a fuel injection pump is connected through a link to a floating lever at its end. The one end of the floating level is pivotally secured to a housing of the fuel injection pump by a fulcrum, and a start spring is fixed at one end thereof to the housing and is also secured at the other end thereof to one side end of the floating lever, and a guide lever is pivotally secured at one end thereof to the housing by a fulcrum and is engaged through a shaft at the intermediate thereof with the intermediate of the floating lever. The guide lever is also secured pivotally to the intermediate of a shifter through a shaft. This shifter is axially slidably engaged with the end of a rotary drive shaft having flyweights at one end, and is contacted with the flyweights, by which the shifter is slidably pushed rearwardly. The rear end of the shifter is contacted with one side of a regulator lever which is pivotally secured at the other end to the fulcrum to which the guide lever is pivotally secured. A main spring is secured at one end thereof to the intermediate of the regulator lever, and a full load stopper is provided at the other end of the regulator lever. The other end of the spring is secured to the end of a throttle lever, which is secured pivotally at the intermediate of the same side near the spring to the housing by a fulcrum and which is manually operated at the opposite side end to the spring.

In such construction of the fuel injection pump, when the engine is accelerated, that is, when the fuel delivery of the fuel injection pump is increased, the throttle lever is pivotally inclined at a predetermined angle counterclockwise. Therefore, the regulator lever is pivotally inclined clockwise by the spring, and the end of the regulator lever pushes the shifter toward the regulator lever. This shifter also receives the force toward the drive shaft by the lever centrifugal of the centrifugal force of the flyweights provided at the rotary drive shaft. Consequently, the shifter moves toward the drive shaft until the tention of the spring balances with the centrifugal force of the flyweights. If the shifter moves toward the regulator lever, the guide lever is pivotally inclined clockwise so that the floating lever is pivotally inclined counterclockwise through the shaft. Thus, the control rack is pushed forwardly through the link so as to increase the fuel delivery of the fuel injection pump by proper amount in order to accelerate the engine properly.

However, if the throttle lever is abruptly operated so as to accelerate the fuel injection pump, the shifter also receives the force to abruptly move toward the drive shaft, but since the centrifugal force of the flyweights are not abruptly increased, it happens that the shifter is moved toward the regulator lever. More particularly, since the rotary speed of the rotary drive shaft is that corresponding to the position of the throttle lever before manually operated, the lever action force by the centrifugal force of the flyweights is small, and accordingly the shifter is moved toward the drive shaft until the regulator lever collides with the full load stopper. Therefore, the control rack is pushed to the position of maximum fuel injection. Thus, the fuel of more than the required amount is injected to the fuel injection pump to the engine during several seconds while the shifter is moved to the proper position by the acceleration of the engine, that is, by the increase of the centrifugal force of the flyweights due to the increase of the rotary speed of the drive shaft.

Therefore, if the intaken amount of a machine such as,for example, an engine with a supercharger is tentatively insufficient for the fuel injection amount when it is abruptly accelerated, incomplete combustion takes place in the engine by the response of the above governor so that there take place exhaust of CO gas, exhaust of dirty colored exhaust gas, etc.

SUMMARY OF THE INVENTION This invention contemplates to eliminate the aforementioned disadvantages of the conventional governor of a fuel injection pump for an internal combustion engine and to provide a novel and improved governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine.

It is, therefore, an object of the present invention to provide a governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine in which a control rack does not move abruptly when the throttle lever is quickly operated so as not to supply excessive fuel to the fuel injection pump.

It is another object of the present invention to provide a governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine in which the control rack is not pushed to the maximum fuel injection position of the fuel injection pump when the engine is in no load and at minimum speed.

According to one aspect to the present invention, there is provided a governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine having a control rack for controlling the fuel delivery of a fuel injection pump, a link pivotally connected atone end to one end of the control rack, a floating lever pivotally connected at one side thereof to the other. end of the link, a start spring fixed at one end thereof to a housing and secured at the other end thereof to one side of the floating lever, a guide lever pivotally secured at one end thereof to the housing by a first fulcrum and engaged through a first shaft at the intermediate thereof with the intermediate of the floating lever, pivotally mounted centrifugal flyweights pivotally secured to the drive shaft of the fuel injection pump, a shifter axially slidably engaged with the drive shaft and the centrifugal flyweights at one end thereof and pivotally secured at the intermediate thereof to the other end of the guide lever, a regulator lever pivotally secured at one end thereof to the first fulcrum and slidably contacted at the other side with the other end of the shifter, a spring secured at one end thereof to the intermediate of the regulator lever, a stopper for stopping the regulator lever at the other end in full load of the fuel injection pump, and a throttle lever secured at one end thereof to the other end of the spring and pivotally secured at the same side thereof to the housing by a second fulcrum .and manually operable at the other end thereof, the improvement in the governor comprising cam means having an axially long hold slidably engaging the other end of said floating lever through a movable fulcrum for controlling the control rack so that the control rack does not move abruptly when said throttle lever is quickly operated, and stopper means contacted with said cam means for stopping said cam means so that said control rack is not pushed to the maximum fuel injection position of said fuel injection pump when the engine is in no load and at minimum speed.

BRIEF DESCRIPTION OF THE DRAWINGS These and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view of the conventional governor used in a fuel injection pump for an internal combustion engine;

FIG. 2 is a schematic view of one embodiment of the governor for controlling the fuel delivery of a fuel injcction pump for an internal combustion engine of the present invention; and

FIG. 3 is a schematic view of another embodiment of the governor of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT For better understanding of the governor of the present invention, the conventional governor will now be described with reference to FIG. 1, which shows the conventional governor used in a fuel injection pump for an internal combustion engine.

Reference is now made to the drawings, wherein the like reference numerals designate identical, or corresponding parts throughout the several views, and to FIG. 1.

In the conventional governor, a control rack 1 for increasing and decreasing the fuel delivery ofa fuel injection pump (not shown) is connected through a link 2 to a floating lever 3 at its end. The one end of the floating lever 3 is pivotally secured to a housing of the fuel injection pump by a fulcrum 4, and a start spring 5 is fixed at one end thereof to the housing and is also secured at the other end thereof to one side end of the floating lever 3, and a guide lever 6 is pivotally secured at one end thereof to the housing by a fulcrum and is engaged through a shaft 7 at the intermediate thereof with the intermediate of the floating lever 3. The guide lever 6 is also secured pivotally to the intermediate of a shifter 9 through a shaft 8. This shifter 9 is axially slidably engaged with the end of a rotary drive shaft 11 having flyweights at one end, and is contacted with the flyweights 10, by which the shifter 9 is slidably pushed rearwardly. The rear end of the shifter 9 is contacted with one side ofa regulator lever 12 which is pivotally secured at the other end to the fulcrum to which the guide lever 6 is pivotally secured. A main spring 13 is secured at one end thereof to the intermediate of the regulator lever 12, and a full load stopper 14 is provided at the other end of the regulator lever 12. The other end of the spring 13 is secured to the end of a throttle lever 15, which is secured pivotally at the intermediate ofthe same side near the spring 13 to the housing by a fulcrum and which is manually operated at the opposite side end to the spring 13.

In this construction of the governor, when the engine (not shown) is accelerated, that is, when the fuel delivery of the fuel injection pump (not shown) is increased, the throttle lever 15 is pivotally inclined at a predetermined angle counterclockwise of the drawing. Therefore, the regulator lever 12 is pivotally inclined clockwise by the spring 13, and the end of the regulator lever 12 pushes the shifter 9 leftwardly of the drawing. This shifter also receives the force rightwardly of the drawing by the lever action of the centrifugal force of the flyweights 10 provided at the rotary drive shaft 11. Consequently, the shifter 9 moves leftwardly of the drawing until the tension of the spring 13 balances with the centrifugal force of the flyweights 10. If the shifter 9 moves leftwardly of the drawing, the guide lever 6 is pivotally inclined clockwise so that the floating lever 3 is pivotally inclined counterclockwise through the shaft 7. Thus, the control rack 1 is pushed leftwardly of the drawing through the link 2 so as to increase the fuel delivery of the fuel injection pump by proper amount in order to accelerate the engine properly.

However, if the throttle lever 15 is abruptly operated so as to accelerate the fuel injection pump, the shifter 9 also receives the force to abruptly move leftwardly of the drawing, but since the centrifugal force of the flyweights 10 are not abruptly increased, it happens that the shifter 9 is moved leftwardly more than the required amount. More particularly, since the rotary speed of the rotary drive shaft 11 is that corresponding to the position of the throttle lever 15 before manually operated, the lever action force by the centrifugal force of the flyweights 10 is small, and accordingly the shifter 9 is moved leftwardly of the drawing until the regulator lever 12 collides with the full load stopper 14. Therefore, the control rack l is pushed to the position of maximum fuel injection. Thus, excessive amount of fuel is supplied to the fuel injection pump to the engine during several seconds while the shifter 9 is moved to the proper position by the acceleration of the engine, that is, by the increase of the centrifugal force of the flyweights 10 due to the increase of the rotary speed of the drive shaft 11. Consequently, incomplete combustion takes place in the engine so that there take place exhaust of CO gas, exhaust of dirty colored exhaust gas,

etc. 1

Reference is now made to FIG. 2, which shows one embodiment of the governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine.

The governor of the present invention is so constructed, as shown in FIG. 2, that the fulcrum 4 of the floating lever 3 is made movable. That is, the movable fulcrum 4 is slidably engaged with the axially long hole 17a ofa cam 17 pivotally secured to a shaft 16. The end of the cam 17 is contacted with a stopper l8 urged by a spring 18a at one side and with the throttle lever 15 at the other side, and the cam 18 is affected by the main spring 13 clockwise of the drawing by the throttle lever 15 and by the stopper 18 counterclockwise by the spring 18a to be controlled.

The stopper l8, throttle lever 15, link 2, floating lever 3, guide lever 6, and cam 17 are so mounted with each other as shown in FIG. 2 when the throttle lever 15 is disposed to indicate that the engine is in no load and at minimum speed. That is, the cam 17 is disposed between the end of the stopper l8 mostly projected and the throttle lever 15, and is pushed by both.

At this time, the control rack l is disposed at no load and minimum speed position, but the movable fulcrum 4 is assumed to be fixed at its position, and even if the shifter 9 is moved leftwardly of the drawing until the regulator lever 12 collides with the full load stopper 14, it is so disposed that the control rack 1 is not pushed over to a predetermined fuel injection position less than the maximum fuel injection position.

In operation of thus constructed governor of the present invention, when the throttle lever 15 is disposed at no load and minimum speed position, the cam 17 is disposed at the position as shown in FIG. 2, and,

since the cam 17 is restricted by both the throttle lever 15 and the stopper 18, the movable fulcrum 4 is not moved.

If the throttle lever 15 is abruptly operated or inclined counterclockwise for quick acceleration, the shifter 9 moves leftwardly of the drawing until the regulator lever 12 is contacted with the full load stopper 14 as aforementioned. Therefore, the floating lever 3 is abruptly inclined through the guide lever 6 around the movable fulcrum 4 as a center so that the control ack 1 is abruptly pushed into the fuel injection pump so as to accelerate the engine. In this case, the movable fulcrum 4 becomes tentatively stationary center. Accordingly, the control rack 1 is not pushed over a predetermined value or position, and accordingly the fuel is not injected by maximum amount.

If the engine speed is increased and the centrifugal force of the flyweights becomes increased, the shifter 9 is moved rightwardly until the force of the main spring 13 balances with the centrifugal force. At this time, since the cam 17 is not pushed by the throttle lever 15, it is inclined counterclockwise of the drawing by the inclination of the guide lever 6 and floating lever 3 upon rightward movement of the shifter 9 so that the movable fulcrum 4 slides in the long hole 17a toward the end of the cam 17.

In order to control necessarily the inclining speed of the cam 17, a spring 19 tensioned weakly and adjustable in tension may be acted opposite to its inclination. The control rack l is pushed into the fuel injection pump by the movement of the movable fulcrum 4 so as to increase the fuel injection. The movable fulcrum 4 is stopped at the position determined by the maximum fuel injection required in full load operation.

In order to stop the engine, if the throttle lever is operated clockwise of the drawing against the tension of the spring 18a, the control rack 1 is pulled out ofthe fuel injection pump so that the fuel injection amount becomes zero so as to stop the engine.

It should be understood from the foregoing description that since the fulcrum of the floating'lever is made movable so that the movable fulcrum is moved in the direction that the control rack is accelerated by the movement of the shifter after the rotation of the flyweights is increased in the governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine in which the shifter is moved by the balance of the force of the main spring connected to the throttle lever and the centrifugal force of the flyweights provided at the rotary drive shaft thereby controlling the fuel injection pump through the guide lever and floating lever, the control rack is not abruptly moved even by abrupt movement of the throttle lever to accelerate or decelerate the engine so that it is properly moved adjustablyto a predetermined position at proper speed, and accordingly it is prevented that the excessive fuel is injected to take place incomplete combustion, CO gas is produced to exhaust polluted exhaust gas.

Referring now to FIG. 3, which shows another embodiment of the governor of the present invention, the governor has an intermediate lever 20 pivotally secured to the housing by a fulcrum 21 and having a recess 22 at the intermediate, and a throttle lever 15 has a projection 23 provided corresponding to the position of the recess 22 of the intermediate lever 20 so that when the throttle lever 15 is at idling position the projection 23 is engaged with the recess 22 of the intermediate lever 20. Instead of the cam 17 of the previous embodiment of the governor, another link 24 is formed as shown in FIG. 3 and is provided in contact with the stopper 18 at one side thereof and in contact with the other end of the intermediate lever 20 through a projection 25 threadedly engaged at the other side thereof and has a long hole 240 for engaging slidably movable fulcrum 4 at the end of the floating lever 3 similar to the previous embodiment.

In operation of thus constructed governor of this embodiment of the present invention, if the throttle lever 15 is moved from full load position to idling position, the projection 23 of the throttle lever 15 is fitted in contact with the recess 22 of the intermediate lever 20 so as to rotate pivotally the intermediate lever 20 counterclockwise of the drawing as designated by an arrow so that the intermediate lever 20 pushes the one side of the link 24 so as to rotate the link 24 clockwise of the drawing as designated by an arrow with the result that the link 24 is disposed to the idling position of the en gine through the floating lever 3, link 2 and control rack 1.

Thus, the link 24 is indirectly moved to the idling position of the engine.

What we claim is:

1. A governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine having a control rack for controlling the fuel delivery of the fuel injection pump, a link pivotally connected at one end to one end of the control rack, a floating lever pivotally connected at one side thereof to the other end of the link, a start spring fixed at one end thereof to a housing of the fuel injection pump and secured at the other end thereof to one side end of the floating lever, a guide lever pivotally secured at one end thereof to the housing by a first fulcrum and engaged through a first shaft at the intermediate thereof with the intermediate of the floating lever, pivotally mounted centrifugal flyweights pivotally secured to the drive shaft of thefuel injection pump, a shifter axially slidably engaged with the drive shaft and the centrifugal flyweights at one end thereof and pivotally secured at the intermediate thereof to the other end of the guide lever, a regulator lever pivotally secured at one end thereof to the first fulcrum and slidably contacted at the other side with the other end of the shifter, a spring secured at one end thereof to the intermediate of the regulator lever, a stopper for stopping the regulaing an axially long hole slidably engaging the other end of said floating lever through a movable fulcrum for controlling the control rack so that the control rack does not move abruptly when the throttle lever is quickly operated, and stopper means contacted with said cam means for stopping said cam means so that the control rack is not pushed to the maximum fuel injection position of the fuel injection pump when the engine is in no load and at minimum speed.

2. A governor as set forth in claim 1, further comprising another spring tensioned weakly and adjustable in tension and secured at one end to said cam means and at the other end to said stopper means.

3. A governor as set forth in claim 1, further comprising an intermediatelever pivotally secured to the housing by a fulcrum and having a recess at the intermediate, said throttle lever having a projection provided corresponding to the position of the recess of said intermediate lever so that when the throttle lever is at idling position the projection is engaged with the recess of said intermediate lever, wherein said cam means is a link provided in contact with said stopper means at one side thereof and in contact with the other end of said intermediate lever through a projection threadedly engaged at the other side thereof and having a long hole for engaging slidably movable fulcrum of the end of the floating lever. 

1. A governor for controlling the fuel delivery of a fuel injection pump for an internal combustion engine having a control rack for controlling the fuel delivery of the fuel injection pump, a link pivotally connected at one end to one end of the control rack, a floating lever pivotally connected at one side thereof to the other end of the link, a start spring fixed at one end thereof to a housing of the fuel injection pump and secured at the other end thereof to one side end of the floating lever, a guide lever pivotally secured at one end thereof to the housing by a first fulcrum and engaged through a first shaft at the intermediate thereof with the intermediate of the floating lever, pivotally mounted centrifugal flyweights pivotally secured to the drive shaft of the fuel injection pump, a shifter axially slidably engaged with the drive shaft and the centrifugal flyweights at one end thereof and pivotally secured at the intermediate thereof to the other end of the guide lever, a regulator lever pivotally secured at one end thereof to the first fulcrum and slidably contacted at the other side with the other end of the shifter, a spring secured at one end thereof to the intermediate of the regulator lever, a stopper for stopping the regulator lever at the other end in full load of the fuel injection pump, and a throttle lever secured at one end thereof to the other end of the spring and pivotally secured at the same side thereof to the housing by a second fulcrum and manually operable at the other end thereof, the improvement comprising cam means having an axially long hole slidably engaging the other end of said floating lever through a movable fulcrum for controlling the control rack so that the control rack does not move abruptly when the throttle lever is quickly operated, and stopper means contacted with said cam means for stopping said cam means so that the control rack is not pushed to the maximum fuel injection position of the fuel injection pump when the engine is in no load and at minimum speed.
 2. A governor as set forth in claim 1, further comprising another spring tensioned weakly and adjustable in tension and secured at one end to said cam means and at the other end to said stopper meAns.
 3. A governor as set forth in claim 1, further comprising an intermediate lever pivotally secured to the housing by a fulcrum and having a recess at the intermediate, said throttle lever having a projection provided corresponding to the position of the recess of said intermediate lever so that when the throttle lever is at idling position the projection is engaged with the recess of said intermediate lever, wherein said cam means is a link provided in contact with said stopper means at one side thereof and in contact with the other end of said intermediate lever through a projection threadedly engaged at the other side thereof and having a long hole for engaging slidably movable fulcrum of the end of the floating lever. 